A system for generating an aqueous ozone solution employs a mixing assembly disposed within an auxiliary compartment coupled to an external sidewall of an ozone supply unit enclosure. The mixing assembly includes a first flow path for water to flow through and a second flow path in parallel with the first flow path. The first flow path includes one or more ozone intake ports that are fluidically coupled to one or more ozone output ports of the ozone supply unit enclosure. The second flow path includes a control valve that selectively permits a portion of the water to flow through the second flow path to produce a negative pressure in the first flow path so that ozone is drawn into the first flow path through the one or more ozone intake ports and mixed into the water flowing through the first flow path to produce an aqueous ozone solution.

A reagent system for treating heavy metal-contaminated materials is provided and includes an oxidizer, a soluble phosphate, and an alkaline hydroxide source, such as a caustic soda or lime. A method of treating mine waste bearing one or more heavy metals is also provided and includes the step of admixing a reagent system with heavy metal-containing material to preferentially reduce the leachability of heavy metals and form precipitates and complexes of low metal solubility that remain stable within the host solid matrix for long durations in acidic and abrasive conditions.

An adsorbent includes a porous substrate and a carboxylic acid dimer loaded onto the porous substrate. The carboxylic acid dimer is loaded on the surface or in the plurality of holes of the porous substrate. The average pore size of the porous substrate is not smaller than 2 nm. The carboxylic acid dimer is loaded onto the porous substrate by at least one of the following manners: a) the carboxylic acid dimer is loaded onto the porous substrate through a Si—OH bond; b) the carboxylic acid dimer is loaded onto the porous substrate through the exchange between a carboxyl group and chlorine; c) the carboxylic acid dimer is loaded onto the porous substrate through the exchange between a carboxyl group and a hydroxyl group; and d) the carboxylic acid dimer is loaded onto the porous substrate through the coordination of a carboxyl group and aluminum or silicon.

A method of oxidizing a component of an aqueous medium is provided. The method includes adding an effective amount of an oxidizing composition to the aqueous medium. The oxidizing composition includes an ingredient, such as hydrogen peroxide, a percarbonate salt, a peroxy compound, a chlorite or alkali metal salt thereof, a chlorate or alkali metal salt thereof, or any combination thereof. The method also includes oxidizing the component. The component may be a metal, a mineral, a microbial metabolite, an organic molecule, or combination thereof. The method also includes modulating the application of the oxidizing composition based on a measured aqueous medium parameter.

A process for treating acid mine drainage removes iron ions from the acid mine drainage in the form of zero-valent iron nanoparticles which can be subsequently used for environmental remediation.

A method of treating a landfill leachate containing ammoniacal nitrogen and phosphate by mixing with seawater to precipitate magnesium ammonium phosphate (MAP) also known as struvite. Effects of pH, temperature, stirring speed, and magnesium to ammonia molar ratio on leachate properties such as COD, ammoniacal nitrogen, phosphate content, color, turbidity, amount of magnesium, iron and zinc are disclosed. The method provides high removal efficiency for removal of ammoniacal nitrogen, phosphate, COD, color and turbidity. The method provides a cost-effective system for treatment of landfill leachate and recovery of MAP.

An apparatus for the treatment of acid mine drainage and selective recovery of at least one of metals, critical elements, sulphuric acid and water is disclosed. The apparatus includes at least one electrochemical reactor, at least one catholyte reservoir and at least one anolyte reservoir for containing the acid mine drainage and a buffer, respectively. The reservoirs are in fluid communication with the at least one electrochemical reactor. The apparatus also includes at least one sensor for monitoring a pH of a contents of the reactor; and a power source for supplying an electrical current to the at least one electrochemical reactor. The electrical current is supplied until a predetermined pH is reached for the selective recovery of the at least one of metals, critical elements, sulphuric acid and water. A process for the treatment of acid mine drainage is also disclosed.

A water treatment apparatus includes: a treatment tank, having therein a grounded electrode and a high-voltage electrode opposing the grounded electrode, for generating electric discharge between both the electrodes, and causing to-be-treated water to pass between the electrodes and contact with the electric discharge to perform water treatment, an ozone mixing portion for supplying ozone-containing gas in the treatment tank through a gas sending portion to the to-be-treated water supplied from outside, and a gas returning portion for sending gas in the ozone mixing portion to the treatment tank, are provided, and water treatment is performed by ozone in the ozone mixing portion, and water treatment is thereafter performed by the electric discharge in the treatment tank.

A crosslinked resin made up of polymerized units of a linear polyamine with at least 3 primary and/or secondary amine functionalities and a bisacrylamide. The crosslinked polymers are porous spherical particles with a BET surface area in the range of 50-120 m.sup.2/g. A method of the synthesizing the crosslinked polymer is specified. A method for using the crosslinked resin as an adsorbent material in removing pollutants including organic dyes (e.g. Congo red, Rhodamine B) and heavy metals from an aqueous solution or an industrial wastewater sample is also described.

An air scrubber system including a system for creating an oxidation reduction potential (ORP) in water is disclosed. The system includes a pipe assembly for in-line mixing. The pipe assembly includes a first flow path for water to flow through. The first flow path includes one or more ozone intake ports that are fluidically coupled to one or more ozone output ports of an ozone supply unit. The pipe assembly further includes a second flow path fluidically coupled in parallel with the first flow path. The second flow path includes a control valve that selectively permits a portion of the water to flow through the second flow path to produce a negative pressure in the first flow path so that ozone is drawn into the first flow path through the one or more ozone intake ports and mixed into the water flowing through the first flow path.